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Am J Physiol Heart Circ Physiol 273: H593-H599, 1997;
0363-6135/97 $5.00
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AJP - Heart and Circulatory Physiology, Vol 273, Issue 2 593-H599, Copyright © 1997 by American Physiological Society

ARTICLES

Role of the renin-angiotensin system in cardiac hypertrophy induced in rats by hyperthyroidism

H. Kobori, A. Ichihara, H. Suzuki, T. Takenaka, Y. Miyashita, M. Hayashi and T. Saruta
Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan.

This study was conducted to examine whether the renin-angiotensin system contributes to hyperthyroidism-induced cardiac hypertrophy without involving the sympathetic nervous system. Sprague-Dawley rats were divided into control-innervated, control-denervated, hyperthyroid-innervated, and hyperthyroid-denervated groups using intraperitoneal injections of thyroxine and 6-hydroxydopamine. After 8 wk, the heart-to-body weight ratio increased in hyperthyroid groups (63%), and this increase was only partially inhibited by sympathetic denervation. Radioimmunoassays and reverse transcription-polymerase chain reaction revealed increased cardiac levels of renin (33%) and angiotensin II (53%) and enhanced cardiac expression of renin mRNA (225%) in the hyperthyroid groups. These increases were unaffected by sympathetic denervation or 24-h bilateral nephrectomy. In addition, losartan and nicardipine decreased systolic blood pressure to the same extent, but only losartan caused regression of thyroxine-induced cardiac hypertrophy. These results suggest that thyroid hormone activates the cardiac renin-angiotensin system without involving the sympathetic nervous system or the circulating renin-angiotensin system; the activated renin-angiotensin system contributes to cardiac hypertrophy in hyperthyroidism.


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